i went with a webasto 2020.these units are cheap to get right know.
how long are you running on wvo.any problems??
It more than likely is 30K BTU input of fuel.
I personally don't know why everyone wants a Proheat type heating system. They're complicated, require maintenance, are expensive, have numerous hoses and fittings that can fail taking out your entire heating system, etc. And at a cost of $6-10,000.00!?TomC
Okay, I've created a diagram for the system I think I want to build. I haven't used a heat exchanger to isolate the engine coolant, but I'm not actually planning on using the Proheat to warm the engine, I'm planning on using it as an alternate heater/preheater for the veggie oil.good ideas!!i wanted a heat exchanger first also,for the same reasons you have.after setting up my system for the house,i changed my mind on the bus and went with only one coolant system.you have to understand that every heatexchanger means losses and also has to be sized right to do the job.then you need more pumps,second coolant system needs an expansion tank etc....on the other side,you want to use your engine coolant heat to be used while driving for heat and wvo.every valve,heat exchanger connection is a point where you can get leaks.then you need to balance the flow.to many systems in parallel and maybe one wont perform good enough.in the summer your cabin heaters are off ,but still you need all the heat for wvo.the only problem with coolant leaks on my wvo systems,that i had on my trucks is mostly with the hose in hose fuel line to the tank.after lots of test i found that aluminum is the only way to go for the line inside the 3/4 inch heater hose.on cooper i had the wvo reacting with it after sitting for long times.problem is that the brass fittings and the aluminum line tend to work over time and like to leak.if they are monted where you cant see it,that can be a problem.that why i went with the surge tank on the fuel system for the bus.so its enough that i bundled the transfer lines from the main tank to the outside of the heater liners to the front heater.this way (surge tank)i also dont have to heat the whole main tank to coolant temp.on my trucks i found a lot of condensation water in the tanks,if i used them only for short trips.do to the heating and cooling of the wvo.as for coolant leaks.i trust my low level warning and always (with the detroit)i have an eye on the temp gauge.thats my way,less parts less trouble.if you are interested in how i set up my fuel system,i can try to get pics and explain it better!im still working on my english (even after so many years here now) and fighting with my computer skills,as i wanted to set up a site with the story of the bus and my other wvo and solar house systems.but thats when......
So I'm reconsidering using some 24V or 120V fan powered heat exchangers - the power consumption isn't much of a problem because I have a hefty electrical system. Any suggestions on which heat exchangers to look at? I'm somewhat tempted to build my own using car heater cores and 24V fans like gumpydog does on his site...